INFO: task udevd:27378 blocked for more than 143 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23520 pid:27378 tgid:27378 ppid:5197 task_flags:0x40054c flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
io_schedule+0x7f/0xd0 kernel/sched/core.c:7835
folio_wait_bit_common+0x6d8/0xbc0 mm/filemap.c:1323
__folio_lock mm/filemap.c:1704 [inline]
folio_lock include/linux/pagemap.h:1159 [inline]
__filemap_get_folio_mpol+0x13e/0xb00 mm/filemap.c:1959
__filemap_get_folio include/linux/pagemap.h:763 [inline]
truncate_inode_pages_range+0x48b/0xe30 mm/truncate.c:413
kill_bdev block/bdev.c:91 [inline]
blkdev_flush_mapping+0x109/0x2f0 block/bdev.c:728
blkdev_put_whole block/bdev.c:735 [inline]
bdev_release+0x417/0x650 block/bdev.c:1160
blkdev_release+0x15/0x20 block/fops.c:705
__fput+0x44f/0xa70 fs/file_table.c:469
task_work_run+0x1d9/0x270 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x70f/0x23c0 kernel/exit.c:976
do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
get_signal+0x1284/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f4cdd7407
RSP: 002b:00007ffe9bccf880 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: fffffffffffffffc RBX: 00007f2f4cd4b880 RCX: 00007f2f4cdd7407
RDX: 0000000000000200 RSI: 00007f2f4cd4a000 RDI: 0000000000000009
RBP: 000055c44431d050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 000055c444316a48 R15: 00007f2f4cff039c
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e75e5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75e5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75e5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5587:
#0: ffff8880374ab0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by udevd/27378:
#0: ffff8880271ff358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1a9/0x650 block/bdev.c:1144
2 locks held by syz.0.9703/8407:
1 lock held by syz.2.9711/8449:
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv+0x637/0x27b0 net/netfilter/nfnetlink.c:665
2 locks held by syz.2.9711/8450:
#0: ffff8880868264d8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:11347
#1: ffffffff8e7648b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#1: ffffffff8e7648b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
2 locks held by syz.2.9711/8451:
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv+0x637/0x27b0 net/netfilter/nfnetlink.c:665
#1: ffff8880868264d8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:11347
1 lock held by syz.2.9711/8452:
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv+0x637/0x27b0 net/netfilter/nfnetlink.c:665
1 lock held by syz.2.9711/8453:
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv+0x637/0x27b0 net/netfilter/nfnetlink.c:665
1 lock held by syz.2.9711/8454:
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
#0: ffffffff9a7bb3b8 (nfnl_subsys_nftables){+.+.}-{4:4}, at: nfnetlink_rcv+0x637/0x27b0 net/netfilter/nfnetlink.c:665
1 lock held by dhcpcd-run-hook/8457:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8458 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3802 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3821 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3876 [inline]
RIP: 0010:__lock_acquire+0xc4c/0x2cf0 kernel/locking/lockdep.c:5237
Code: 48 ff cb f7 c1 00 60 00 00 74 c3 e9 90 00 00 00 48 c7 c7 f0 c9 62 8e 4c 89 fe e8 ef 60 4a 03 48 8b 54 24 18 eb c3 48 8b 48 18 <48> 39 e9 0f 84 b9 00 00 00 48 8b 40 08 48 85 c0 0f 84 ca fe ff ff
RSP: 0018:ffffc90005a7f1f8 EFLAGS: 00000046
RAX: ffffffff942ae450 RBX: 000000000006f998 RCX: 692ec17b2a5f7216
RDX: 00000000982f9700 RSI: 0000000013c42764 RDI: ffff888061830000
RBP: 692ec17b2a5f7216 R08: ffffffff81b342d9 R09: ffffffff9a2cc508
R10: dffffc0000000000 R11: fffffbfff2023677 R12: ffff888061830b80
R13: ffff888061830b80 R14: ffff888061830000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88812554e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f77d3a39000 CR3: 0000000031f94000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access+0x95/0x100 include/linux/seqlock.h:73
ktime_get_coarse_real_ts64_mg+0x59/0x1e0 kernel/time/timekeeping.c:2450
current_time+0x96/0x370 fs/inode.c:2376
atime_needs_update+0x320/0x6d0 fs/inode.c:2236
touch_atime+0x82/0x6b0 fs/inode.c:2253
file_accessed include/linux/fs.h:2263 [inline]
ext4_file_mmap_prepare+0x24d/0x440 fs/ext4/file.c:824
vfs_mmap_prepare include/linux/fs.h:2075 [inline]
call_mmap_prepare mm/vma.c:2644 [inline]
__mmap_region mm/vma.c:2743 [inline]
mmap_region+0xdac/0x22a0 mm/vma.c:2844
do_mmap+0xc39/0x10c0 mm/mmap.c:559
vm_mmap_pgoff+0x2c9/0x4f0 mm/util.c:581
ksys_mmap_pgoff+0x51e/0x760 mm/mmap.c:605
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f77d3a64242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffc24a992d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f77d3788000 RCX: 00007f77d3a64242
RDX: 0000000000000005 RSI: 0000000000008000 RDI: 00007f77d3788000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000003000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc24a99328
R13: 00007f77d3a38b20 R14: 00007ffc24a99710 R15: 00000fff8495325e